Although theoretically capacitors in an AC circuit power do not consume, in reality they are due to the presence of losses can be allocated some the amount of heat.
Check in advance the suitability of a capacitor for use in the source, just connecting it to the mains and estimating the temperature of the hull in half an hour. If the capacitor has time to warm up noticeably, it should be considered the for use in the source.
Virtually no heat special capacitors for industrial electrical installations - they are designed for a large reactive power. These capacitors are used in fluorescent lamps, electronic control devices, induction motors, etc.
Below are two practical schemes power supplies with capacitor divider: pyativoltovom General purpose load current up to 0.3 A (Fig. 6.3) and uninterruptible power supply for kartsovnik electro-mechanical watches (Fig. 6.4).
A voltage divider pyativoltovom source consists of a paper capacitor C1 and two oxide C2 and C3 forming the bottom under the scheme nonpolar shoulder capacity 100 UF. Polarizing diodes oxide pairs are left under the scheme diodes of the bridge.
For component values indicated in the diagram, the short-circuit current output the PSU is 600 mA, the voltage across the capacitor C4 in the absence of load - 27 V.
Widespread electro-mechanical clock-alarm clocks Chinese production is usually fed from a single galvanic cell voltage of 1.5 V.
The proposed source produces a voltage of 1.4 V At average load current 1 mA. The voltage taken from the divider C1, C2, straightens node on the elements VD1, VD2, C3. No load voltage on the capacitor C3 does not exceed 12 V.
Author: A. P. Seman